Research on the torsional effect and control of RC frame structure with multiple different elevations
Considering factors such as slope excavation quantity and slope stability,RC frame structures supported by foundations with different elevations(FSSFDEs)often occur,resulting in irregular structures and significant torsion.To study the torsional effects and corresponding control measures for FSSFDEs,the reliability of the finite element model was verified using pseudo-static tests and shaking table tests.Sixteen finite element models with varying structural parameters were analyzed using both elastic and elastoplastic dynamic finite element analysis.The study examined the influence of factors such as the total number of dropped stories,the number of spans and the number of dropped stories at the intermediate ground embedding end,and the number of spans at the upper ground end on the torsional effects of the structures.Additionally,the effectiveness of different torsional control measures was compared through case analysis.The main conclusions are as follows:In the elastic state,the torsional effect of RC frame structures with three different ground elevations is significant in the stories at the intermediate and upper ground ends,and it is smaller than that of structures with two different ground elevations.In the plastic state,it is beneficial to improve the torsional effect of the structure by decreasing the size ratio of the part under upper embedding end corresponding to the overall structure.Setting up horizontal grounding components,steel support or viscosity damping in the RC FSSFDEs can improve the torsion resistance.Setting up horizontal grounding components provides the best improvement on torsion effects for structures on rock slope.
RC frame structure supported by foundations with different elevations(FSSFDE)multiple different elevations:finite element analysistorsional effecttorsion resistance design
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维普
